Process of polymerizing hydrocarbons of the butadiene series



Patented Nov. 1, 1 932 :UNITED STA'TIES PATENT OFFICE LUDWIG VAN Z'U'TPHEN, .01 FRANKFOBT-ON-THE-HAIN-EOCHIST,- GERMANY, ASSIGNOR TO I. G. FARIBENINDUS TRIE AKTIENGESELLSCHAFT, OF FBANKFORT-ON-THE-MAIN,

GERMANY PROCESS OF POLYMEBIZING EYDROCARBONS OF THE BUTADIENE SERIES No Drawing. Application filed December 24, 1929, Serial No. 41am, and in Germany 1511151 79, 1929.

finely homogeneous distribution in a solid diluent, such as, for instance, a metallic salt; this expedient produces a very uniform course of the reaction and the very uniformly polymerized products thus obtained constitute a caoutchouc of high value.

The quant'ty ofsodiuin to be used is ver small. The reaction is suitably carried out in a stationary pressure vessel, at a temperature of between about 10 C. and about 70 C. The optimum lies between 35 C. and 45,

C. The quantity of the sodium metal may vary githin wide limits; about 0.3170 1.5 per 0 the weight of the hydrocarbon which;

is used is suitable. The concentration of the sodium metal with regard to the solid dilucent ent may also be widely varied, for instance about 1/40-1/20 of the weight of the diluent.

The following example illustrates the invention, but it is not intended tolimit it thereto, the parts being by weight:

1.5 parts'of sodium in the form of wire or ribbon and 6Q parts of drysodium chloride are treated in a ball mill in an atmosphele of nitrogen until a homogeneous, finely powdered mixture is produced. This mixture is heated to C. to 40 C. in a'pressure vessel together with 240-270 parts of butadiene until the latter has disappeared. The roduct, is worked up in such a manner that the caoutchouc which is formed is separated from the salt mass containing sodium, this being which ossibly might adhere "to the. caouts is the. same as that described in.

of the butadiene series which consists in treating the hydrocarbon witha homogeneous mixture of metallic sodium and an indifi'er'ent solid metallic salt inthe -form of powder. Y

3. Process of polymerizing hydrocarbons of the butadiene series which consists in-- treating the hydrocarbon with a' homoge neous mixture of metallic sodium and solid sodium chloride in the form of powder.

4. Process of polymerizing butadiene I which consists in treating butadiene with a homogeneous mixture of. metallic sodium and an indifferent solid diluent in the form of powder. v 1

5. Process of, polymerizing butadiene which consists in heating butadiene to 10 C. to 7 0 C. in a pressure vessel together .with ahomogeneous mixture of metallic sodium and solid sodium chloride-in the form of powder;

- 6. Process of polymerizing butadiene which consists in heating butadiene to 35 Cato 45 C. in a pressure vessel together with a homo neous mixture of metallic sodium and solid sodium chloride in the form of owder.

testimony whereoffl afiix my signature; 1 90- LUDWIG VAN zi'i r EN.

'an'easy operation; for removing the sodium chouc t e latter is treated with alcohol and then with water.

The reaction may also be carried out at room tem correspon mgly longer time. v Potassium chloride, anhydrous sodium sulrature, but it then occupies a "fateor dry pumice stone powder may also" 

